Apple

Watch SE 3 40mm

0.0 (0)
  • Apple-Watch SE 3 40mm-slide-1

Customize your device

Same-day

Delivery to sddZipcode

or get it shipped by selecting Ship to me in cart

Starting at $0

A T‑Mobile SIM card connects your device to the T‑Mobile network. Insert this SIM into your new phone and start enjoying all the benefits of our unlimited plans.

Already have a phone you love? Use this SIM card in your unlocked, compatible device to access the T‑Mobile network.

Not sure if your phone is compatible?

Shop for SIM cards for as low 
as $0 today.

The SIM stores your account information and connects your device to the T‑Mobile network. Your phone may have two options for SIM cards, a digital eSIM or a Physical SIM card. Please select one of the following to continue bringing your own device. To select a digital eSIM, please check your device compatibility below by entering your IMEI number.

Starting at $0

The SIM stores your account information and connects your device to the T‑Mobile network.

Shop for SIM cards for as low 
as $0 today.

The SIM stores your account information and connects your device to the T‑Mobile network.

Device options

Loading color options, please wait
Loading
  • Loading
    Loading
  • Loading
    Loading
  • Loading
    Loading
  • Loading
    Loading

startingAtText strikeThroughValue actualMonthlyValue/month for paymentTerms months withPromotionText

Due today: dueToday + tax & other charges

Full price: payInFull + tax

Plus $35 $0 Device Connection Charge Online only

Plus $35 Device Connection Charge

Plus $35 $0 Device Connection Charge

or select Ship to me in cart to have your order shipped.

You already have the maximum number of lines in your cart.

Go to cart

You can purchase a maximum of 5 lines in a single transaction.

Go to cart

You have reached the maximum number of non-phone lines.

Go to cart

You have reached the maximum number of phone lines.

Go to cart

Delivery Options

Est. ship date

shippingDate

Ship to currentZipCode

Are you a new or existing customer?

Welcome to T-Mobile (new customer)

If you're an existing customer, please

Choose Sim Type

What would you like to do today?

Adding a line to your account

model | phoneNumber

 

jumpEligibleText|html

Phone number options

Transfer a number from another carrier or we can provide a new number

Phone number options

Transfer a number from another carrier or we can provide a new number.

This number is eligible

pillTemplate|html Transferring: phoneNumberTemplate|html

This number will remain active on your current device. Contact us to transfer the number to T-Mobile.

This number will remain active on your current device. Your mobile expert will help you transfer your number
to T-Mobile.

Getting a new number

Eligible trade-in device

marketingName | capacity

Device Condition
selectedDeviceCondition|html

Estimated one-time trade-in credit: $oneTimeCredit

In deviceCondition condition

Outstanding trade-in balance: $installmentBalance

This amount must be paid before completing your order. The remaining amount will be added to your cart.

Want to trade in a device?

Have a damaged device? You may still qualify for a promotion.

Skip trade-in

Eligible trade-in device

marketingName | capacity

firstName phoneNumber

Device Condition
selectedDeviceCondition|html

Estimated one-time trade-in credit: $oneTimeCredit

In deviceCondition condition

Outstanding trade-in balance: $installmentBalance

This amount must be paid before completing your order. The remaining amount will be added to your cart.

Want to trade in?

firstName’s marketingName | capacity

Have a damaged device? You may still qualify for a promotion.

To continue, we need more information to verify your trade-in. Please call 1-800-T-MOBILE, or dial 611 from your T-Mobile phone.

Trade-in skipped

Select a trade-in device

Promotion

Applied

promoName

Recurring promotional savings: totalPromotionalValue

Credit of recurringCreditAmount over paymentTerms months

If you cancel before paymentTerms credits, credits stop and balance on required finance agreement may be due; contact us. For well-qualified customers, plus tax. 

Choose a payment option

Find out what you’ll pay with no impact to your credit score.

Check what I qualify for

with promotion
Starting at

If you select to pay monthly and cancel wireless service, the remaining balance on the device becomes due. For well-qualified buyers, 0% APR. Qualifying service required.

You’re protected

Good news! Your current title plan will transfer to your new device.

You’re protected

Good news! Your current title plan will transfer to your new device.

You’re protected

Good news! Your new phone will be protected. Your title plan will transfer to your new device.

priceDifference/month from current protection plan

priceDifference/month from current protection plan

New price: price/month + tax

73% of people have cracked the front screen of their phone

Did you know?

You can change your protection plan anytime by logging into your account

Did you know?

You can change your protection plan anytime by logging into your account

Why has the price for my protection plan changed?

You updated your protection plan to cover another device which has resulted in a price change.


To change your protection plan, log in and visit My account.

inventoryStatus storeName (storeDistance mi)

Want to get it sooner?

Customers also bought

Loading
Loading
Loading
Loading
Loading
Loading
Loading

Key features

326 pixels

Always-On Retina display with OLED and LTPO

Talk Time

18 Hours Standby Time

Other features

  • Health essentials¹˒⁴˒⁵˒⁶
  • Great battery Life ²
  • Always on Display
  • A Great Fitness Partner⁸
  • Stay Connected
  • Safety Features ⁹
  • Apple watch for your kids¹⁰
Apple Watch SE 3 is packed with health, fitness, connectivity, and safety essentials—all for a great value. Track your sleep score. Get richer health insights in the Vitals app.1 Stay active with a wide range of workouts. Save time with fast charging.2 See your info at a glance with the Always-On display. And still get all-day, 18-hour battery life.3

Get our best Apple Deals on the newest iPhones, iPads, and Apple Watches like the stunning new Apple Watch SE 3 40mm, Apple Watch SE 3 44mm , Apple Watch Series 11 46mm and Apple Watch Ultra 3 , available on the nation’s largest and fastest nationwide 5G network.

Holiday shopping? Be sure to explore our guide of holiday gift ideas for everyone on your list and checkout our iPhone Black Friday Deals, as well as all other tech deals for Cyber Monday

Apple Watch SE 3 40mm Quick Facts
  • When was the Apple Watch SE 3 40mm be released? The Apple Watch SE 3 40mm was released on September 19th, 2025.
  • What colors will be available for the Apple Watch SE 3 40mm? The Apple Watch SE 3 40mm will be available in 2 colors: Starlight Aluminum, and Midnight Aluminum, and can be customized with colorful watch bands.
*Color and memory size options may vary in availability online or in store.

1The Vitals app is for wellness purposes only and not for medical use.
2Fast charging is compatible with Apple Watch Series 7 and later, any Apple Watch Ultra model, and Apple Watch SE 3.
3Battery life varies by use and configuration. See apple.com/watch/battery for more information.
4The temperature sensing feature is not intended for medical use. Temperature sensing is available only on Apple Watch Series 8 and later and all Apple Watch Ultra models.
5Sleep apnea notifications are available on Apple Watch Series 9 and later, Ultra 2 and later, and SE 3. The feature is intended to detect signs of moderate to severe sleep apnea for people 18 years old or older without a diagnosis of sleep apnea.
6Irregular rhythm notification requires the latest versions of watchOS and iOS. It is not intended for use by people under 22 years old or those who have been previously diagnosed with atrial fibrillation (AFib).
7Testing conducted by Apple in July and August 2025 using preproduction Apple Watch SE 3 (GPS + Cellular) and Apple Watch SE 2 (GPS + Cellular), each paired with an iPhone; all devices tested with prerelease software, Apple Watch Magnetic Fast Charger to USB-C Cable (Model A2515), and Apple 20W USB-C Power Adapter (Model A2305). Charge time varies with adapter, region, settings, initial battery levels, usage, and environmental factors; actual results will vary.
8Requires an Apple Intelligence–enabled iPhone nearby and Bluetooth headphones with device and Siri language set to English. Apple Intelligence is available in beta. Some features may not be available in all regions or languages. For feature and language availability and system requirements, see support.apple.com/en-us/121115.
9Emergency SOS requires a cellular connection or Wi-Fi calling with an internet connection from your Apple Watch or nearby iPhone. You can use cellular models of Apple Watch to make an emergency call in many locations, provided that cellular service is available. Some cellular networks may not accept an emergency callfrom your Apple Watch if your Apple Watch isn’t activated, if it isn’t compatible with or configured to operate on a particular cellular network, if isn’t set up for cellular service, or if the cellular network does not support emergency calling over IMS. See support.apple.com/108374 and apple.com/watch/cellular for more information.
10Not all features will be available if the Apple Watch is set up through Apple Watch For Your Kids. Check support.apple.com/en-us/109036 for details. Wireless service plan required for cellular service. Check apple.com/watch/cellular for participating wireless carriers and eligibility.
11Wireless service plan required for cellular service. Contact your service provider for more details. Connection may vary based on network availability. Check apple.com/watch/cellular for participating wireless carriers and eligibility. See support.apple.com/HT207578 for additional setup instructions.
12Data plan required. 5G is available in select markets and through select carriers. Speeds vary based on site conditions and carrier. For details on 5G support, contact your carrier and see apple.com/watch/cellular.

What’s in the box

  • Apple Watch SE 3 40mm
  • Band
  • Apple Watch Magnetic Fast Charger to USB-C Cable (1m)

Additional spec details

Battery Description
Built-in rechargeable lithium-ion battery
Ports
Magnetic Charger to USB-C Cable
Connectivity
Wi-Fi 802.11b/g/n 2.4GHz, 5G and LTE,Support for 2.4GHz Wi-Fi networks, Bluetooth 5.3, L1 GPS, NFC
Processor
S10 chip with 64‑bit dual core processor
Operating System
watchOS
Maximum Expandable Memory
0 GB
Wireless Network Technology Generations
4G LTE, 5G
Supported Email Platforms
Apple Mail, POP3, IMAP4, SMTP, Microsoft® Exchange, AOL, AIM, Yahoo!® Mail, GMail
WEA Capable
true
Mobile Hotspot Capable
true
Frequency
LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 38, 40, 41, 66, 71; 5G: n1, n2, n3, n5, n7, n8, n12, n14, n20, n25, n26, n28, n66, n71
Weight
0.93 Ounces
Length
0.42 Inches
Height
1.57 Inches
Width
1.49 Inches

Key features

326 pixels

Always-On Retina display with OLED and LTPO

Talk Time

18 Hours Standby Time

Other features

  • Health essentials¹˒⁴˒⁵˒⁶
  • Great battery Life ²
  • Always on Display
  • A Great Fitness Partner⁸
  • Stay Connected
  • Safety Features ⁹
  • Apple watch for your kids¹⁰
Apple Watch SE 3 is packed with health, fitness, connectivity, and safety essentials—all for a great value. Track your sleep score. Get richer health insights in the Vitals app.1 Stay active with a wide range of workouts. Save time with fast charging.2 See your info at a glance with the Always-On display. And still get all-day, 18-hour battery life.3

Get our best Apple Deals on the newest iPhones, iPads, and Apple Watches like the stunning new Apple Watch SE 3 40mm, Apple Watch SE 3 44mm , Apple Watch Series 11 46mm and Apple Watch Ultra 3 , available on the nation’s largest and fastest nationwide 5G network.

Holiday shopping? Be sure to explore our guide of holiday gift ideas for everyone on your list and checkout our iPhone Black Friday Deals, as well as all other tech deals for Cyber Monday

Apple Watch SE 3 40mm Quick Facts
  • When was the Apple Watch SE 3 40mm be released? The Apple Watch SE 3 40mm was released on September 19th, 2025.
  • What colors will be available for the Apple Watch SE 3 40mm? The Apple Watch SE 3 40mm will be available in 2 colors: Starlight Aluminum, and Midnight Aluminum, and can be customized with colorful watch bands.
*Color and memory size options may vary in availability online or in store.

1The Vitals app is for wellness purposes only and not for medical use.
2Fast charging is compatible with Apple Watch Series 7 and later, any Apple Watch Ultra model, and Apple Watch SE 3.
3Battery life varies by use and configuration. See apple.com/watch/battery for more information.
4The temperature sensing feature is not intended for medical use. Temperature sensing is available only on Apple Watch Series 8 and later and all Apple Watch Ultra models.
5Sleep apnea notifications are available on Apple Watch Series 9 and later, Ultra 2 and later, and SE 3. The feature is intended to detect signs of moderate to severe sleep apnea for people 18 years old or older without a diagnosis of sleep apnea.
6Irregular rhythm notification requires the latest versions of watchOS and iOS. It is not intended for use by people under 22 years old or those who have been previously diagnosed with atrial fibrillation (AFib).
7Testing conducted by Apple in July and August 2025 using preproduction Apple Watch SE 3 (GPS + Cellular) and Apple Watch SE 2 (GPS + Cellular), each paired with an iPhone; all devices tested with prerelease software, Apple Watch Magnetic Fast Charger to USB-C Cable (Model A2515), and Apple 20W USB-C Power Adapter (Model A2305). Charge time varies with adapter, region, settings, initial battery levels, usage, and environmental factors; actual results will vary.
8Requires an Apple Intelligence–enabled iPhone nearby and Bluetooth headphones with device and Siri language set to English. Apple Intelligence is available in beta. Some features may not be available in all regions or languages. For feature and language availability and system requirements, see support.apple.com/en-us/121115.
9Emergency SOS requires a cellular connection or Wi-Fi calling with an internet connection from your Apple Watch or nearby iPhone. You can use cellular models of Apple Watch to make an emergency call in many locations, provided that cellular service is available. Some cellular networks may not accept an emergency callfrom your Apple Watch if your Apple Watch isn’t activated, if it isn’t compatible with or configured to operate on a particular cellular network, if isn’t set up for cellular service, or if the cellular network does not support emergency calling over IMS. See support.apple.com/108374 and apple.com/watch/cellular for more information.
10Not all features will be available if the Apple Watch is set up through Apple Watch For Your Kids. Check support.apple.com/en-us/109036 for details. Wireless service plan required for cellular service. Check apple.com/watch/cellular for participating wireless carriers and eligibility.
11Wireless service plan required for cellular service. Contact your service provider for more details. Connection may vary based on network availability. Check apple.com/watch/cellular for participating wireless carriers and eligibility. See support.apple.com/HT207578 for additional setup instructions.
12Data plan required. 5G is available in select markets and through select carriers. Speeds vary based on site conditions and carrier. For details on 5G support, contact your carrier and see apple.com/watch/cellular.

What’s in the box

  • Apple Watch SE 3 40mm
  • Band
  • Apple Watch Magnetic Fast Charger to USB-C Cable (1m)

Additional spec details

Battery Description
Built-in rechargeable lithium-ion battery
Ports
Magnetic Charger to USB-C Cable
Connectivity
Wi-Fi 802.11b/g/n 2.4GHz, 5G and LTE,Support for 2.4GHz Wi-Fi networks, Bluetooth 5.3, L1 GPS, NFC
Processor
S10 chip with 64‑bit dual core processor
Operating System
watchOS
Maximum Expandable Memory
0 GB
Wireless Network Technology Generations
4G LTE, 5G
Supported Email Platforms
Apple Mail, POP3, IMAP4, SMTP, Microsoft® Exchange, AOL, AIM, Yahoo!® Mail, GMail
WEA Capable
true
Mobile Hotspot Capable
true
Frequency
LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 38, 40, 41, 66, 71; 5G: n1, n2, n3, n5, n7, n8, n12, n14, n20, n25, n26, n28, n66, n71
Weight
0.93 Ounces
Length
0.42 Inches
Height
1.57 Inches
Width
1.49 Inches